# Historical database

Pandora FMS, by default, deletes data older than 45 days from the database ([this value can be configured](https://pandorafms.com/manual/en/documentation/pandorafms/complex_environments_and_optimization/09_pandorafms_engineering#ks1_5)).

Thanks to this functionality, it is possible to **generate reports or graphs with old data without having to occupy this space in the main database.**

<p class="callout info">It is also useful for preserving data for long-term SLAs.</p>